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<title>7.3.23. index_column_diff — Groonga v10.1.1-31-g1e46ba6 documentation</title>
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<li class="nav-item nav-item-this"><a href=""><span class="section-number">7.3.23. </span><code class="docutils literal notranslate"><span class="pre">index_column_diff</span></code></a></li>
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<div class="section" id="index-column-diff">
<h1><span class="section-number">7.3.23. </span><code class="docutils literal notranslate"><span class="pre">index_column_diff</span></code><a class="headerlink" href="#index-column-diff" title="Permalink to this headline">¶</a></h1>
<div class="section" id="summary">
<h2><span class="section-number">7.3.23.1. </span>Summary<a class="headerlink" href="#summary" title="Permalink to this headline">¶</a></h2>
<div class="versionadded">
<p><span class="versionmodified added">New in version 9.0.1.</span></p>
</div>
<p><code class="docutils literal notranslate"><span class="pre">index_column_diff</span></code> command check where indexes are broken or not.</p>
<p>We can found already a broken index by this command.
Normally, we don’t found it unless Groonga refer, delete, or update it.
However, it is possible that Groonga crashes or returns wrong search
results by using it.
it make us want to found it in advance.
This command useful in this case.</p>
<div class="admonition note">
<p class="admonition-title">Note</p>
<p>This command may use many memory and execution time depending on the size of the target index.
Also, if we stop in the middle of execution of this command, the target index may break.
Therefore, we suggest that we don’t execute this command on active system, but execute
this command on standby system.</p>
</div>
</div>
<div class="section" id="syntax">
<h2><span class="section-number">7.3.23.2. </span>Syntax<a class="headerlink" href="#syntax" title="Permalink to this headline">¶</a></h2>
<p>This command takes two parameters.
All parameters are required:</p>
<div class="highlight-none notranslate"><div class="highlight"><pre><span></span>index_column_diff table index_column
</pre></div>
</div>
</div>
<div class="section" id="usage">
<h2><span class="section-number">7.3.23.3. </span>Usage<a class="headerlink" href="#usage" title="Permalink to this headline">¶</a></h2>
<p>Here is an example to check a index column in the database:</p>
<p>Execution example:</p>
<div class="highlight-none notranslate"><div class="highlight"><pre><span></span>table_create Data TABLE_HASH_KEY ShortText
# [[0,1612416118.30525,0.003424882888793945],true]
table_create Terms TABLE_PAT_KEY ShortText \
--default_tokenizer TokenNgram \
--normalizer NormalizerNFKC130
# [[0,1612416136.049046,0.003507614135742188],true]
load --table Data
[
{"_key": "Hello World"},
{"_key": "Hello Groonga"}
]
# [[0,1612416155.418526,0.3676469326019287],2]
column_create \
--table Terms \
--name data_index \
--flags COLUMN_INDEX|WITH_POSITION \
--type Data \
--source _key
# [[0,1612416424.515037,0.00576472282409668],true]
truncate Terms.data_index
# [[0,1612416439.925894,0.009646892547607422],true]
load --table Data
[
{"_key": "Good-by World"},
{"_key": "Good-by Groonga"}
]
# [[0,1612416450.429434,1.51789665222168],2]
index_column_diff Terms data_index
# [
# [
# 0,
# 1612416577.921113,
# 0.006278038024902344
# ],
# [
# {
# "token": {
# "id": 2,
# "value": "hello"
# },
# "remains": [
# ],
# "missings": [
# {
# "record_id": 1,
# "position": 0
# },
# {
# "record_id": 2,
# "position": 0
# }
# ]
# },
# {
# "token": {
# "id": 3,
# "value": "world"
# },
# "remains": [
# ],
# "missings": [
# {
# "record_id": 1,
# "position": 1
# }
# ]
# },
# {
# "token": {
# "id": 1,
# "value": "groonga"
# },
# "remains": [
# ],
# "missings": [
# {
# "record_id": 2,
# "position": 1
# }
# ]
# }
# ]
# ]
</pre></div>
</div>
</div>
<div class="section" id="parameters">
<h2><span class="section-number">7.3.23.4. </span>Parameters<a class="headerlink" href="#parameters" title="Permalink to this headline">¶</a></h2>
<p>This section describes all parameters.</p>
<div class="section" id="table">
<h3><span class="section-number">7.3.23.4.1. </span><code class="docutils literal notranslate"><span class="pre">table</span></code><a class="headerlink" href="#table" title="Permalink to this headline">¶</a></h3>
<p>Specifies the name of a table include check target of the index column.</p>
</div>
<div class="section" id="index-column">
<h3><span class="section-number">7.3.23.4.2. </span><code class="docutils literal notranslate"><span class="pre">index_column</span></code><a class="headerlink" href="#index-column" title="Permalink to this headline">¶</a></h3>
<p>Specifies the name of check target of the index column.</p>
</div>
</div>
<div class="section" id="return-value">
<h2><span class="section-number">7.3.23.5. </span>Return value<a class="headerlink" href="#return-value" title="Permalink to this headline">¶</a></h2>
<p><code class="docutils literal notranslate"><span class="pre">index_column_diff</span></code> command returns result of check indexes:</p>
<div class="highlight-none notranslate"><div class="highlight"><pre><span></span>[HEADER, CHECK_RESULT]
</pre></div>
</div>
<p><code class="docutils literal notranslate"><span class="pre">HEADER</span></code></p>
<p>See <a class="reference internal" href="../command/output_format.html"><span class="doc">Output format</span></a> about <code class="docutils literal notranslate"><span class="pre">HEADER</span></code>.</p>
<p><code class="docutils literal notranslate"><span class="pre">CHECK_RESULT</span></code></p>
<p>This command returns the result of compression between the current
value of the index column and the result of tokenize when this command
execute as below:</p>
<div class="highlight-none notranslate"><div class="highlight"><pre><span></span>{
"token": {
"id": TOKEN_ID,
"value": TOKEN_VALUE
},
"remains": [
{
"record_id": RECORD_ID
}
],
"missings": [
{
"record_id": RECORD_ID,
"position": POSITION
}
]
}
</pre></div>
</div>
<p>If there are something in <code class="docutils literal notranslate"><span class="pre">remains</span></code>, a token that Groonga
was supposed to delete is remaining in a index.</p>
<p>If there are something in <code class="docutils literal notranslate"><span class="pre">missing</span></code>, a token that Groonga
is supposing to remain in a index has been deleted from the index.</p>
<p><code class="docutils literal notranslate"><span class="pre">index_column_diff</span></code> returns nothing as below When indexes haven’t broken:</p>
<div class="highlight-none notranslate"><div class="highlight"><pre><span></span>index_column_diff --table table --name index_column
[[0,0.0,0.0],[]]
</pre></div>
</div>
<div class="section" id="token-id">
<h3><span class="section-number">7.3.23.5.1. </span><code class="docutils literal notranslate"><span class="pre">TOKEN_ID</span></code><a class="headerlink" href="#token-id" title="Permalink to this headline">¶</a></h3>
<p><code class="docutils literal notranslate"><span class="pre">TOKEN_ID</span></code> is id of a broken token.</p>
</div>
<div class="section" id="token-value">
<h3><span class="section-number">7.3.23.5.2. </span><code class="docutils literal notranslate"><span class="pre">TOKEN_VALUE</span></code><a class="headerlink" href="#token-value" title="Permalink to this headline">¶</a></h3>
<p><code class="docutils literal notranslate"><span class="pre">TOKEN_VALUE</span></code> is value of a broken token.</p>
</div>
<div class="section" id="record-id">
<h3><span class="section-number">7.3.23.5.3. </span><code class="docutils literal notranslate"><span class="pre">RECORD_ID</span></code><a class="headerlink" href="#record-id" title="Permalink to this headline">¶</a></h3>
<p><code class="docutils literal notranslate"><span class="pre">RECORD_ID</span></code> is id of a record include a broken token.</p>
</div>
<div class="section" id="position">
<h3><span class="section-number">7.3.23.5.4. </span><code class="docutils literal notranslate"><span class="pre">POSITION</span></code><a class="headerlink" href="#position" title="Permalink to this headline">¶</a></h3>
<p><code class="docutils literal notranslate"><span class="pre">POSITION</span></code> is appearing position of a broken token.</p>
</div>
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<h3><a href="../../index.html">Table of Contents</a></h3>
<ul>
<li><a class="reference internal" href="#">7.3.23. <code class="docutils literal notranslate"><span class="pre">index_column_diff</span></code></a><ul>
<li><a class="reference internal" href="#summary">7.3.23.1. Summary</a></li>
<li><a class="reference internal" href="#syntax">7.3.23.2. Syntax</a></li>
<li><a class="reference internal" href="#usage">7.3.23.3. Usage</a></li>
<li><a class="reference internal" href="#parameters">7.3.23.4. Parameters</a><ul>
<li><a class="reference internal" href="#table">7.3.23.4.1. <code class="docutils literal notranslate"><span class="pre">table</span></code></a></li>
<li><a class="reference internal" href="#index-column">7.3.23.4.2. <code class="docutils literal notranslate"><span class="pre">index_column</span></code></a></li>
</ul>
</li>
<li><a class="reference internal" href="#return-value">7.3.23.5. Return value</a><ul>
<li><a class="reference internal" href="#token-id">7.3.23.5.1. <code class="docutils literal notranslate"><span class="pre">TOKEN_ID</span></code></a></li>
<li><a class="reference internal" href="#token-value">7.3.23.5.2. <code class="docutils literal notranslate"><span class="pre">TOKEN_VALUE</span></code></a></li>
<li><a class="reference internal" href="#record-id">7.3.23.5.3. <code class="docutils literal notranslate"><span class="pre">RECORD_ID</span></code></a></li>
<li><a class="reference internal" href="#position">7.3.23.5.4. <code class="docutils literal notranslate"><span class="pre">POSITION</span></code></a></li>
</ul>
</li>
</ul>
</li>
</ul>
<h4>Previous topic</h4>
<p class="topless"><a href="dump.html"
title="previous chapter"><span class="section-number">7.3.22. </span><code class="docutils literal notranslate"><span class="pre">dump</span></code></a></p>
<h4>Next topic</h4>
<p class="topless"><a href="io_flush.html"
title="next chapter"><span class="section-number">7.3.24. </span><code class="docutils literal notranslate"><span class="pre">io_flush</span></code></a></p>
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